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How to Build an MCP Server (2026 Guide)

A practical, code-first walkthrough of building a Model Context Protocol server — tools, transport, and testing — from a team that ships them in production.

By Rhode Labs · Updated 2026-06-03

What you’ll build

A minimal but real MCP server that exposes a tool to an MCP client like Claude.

First-hand note: paste a working, tested code snippet here and a gotcha you actually hit. A real server.py / server.ts is the unswappable element.

Steps

  1. Install the MCP SDK.
  2. Define a tool (name, schema, handler).
  3. Wire up transport (stdio or HTTP).
  4. Register the server with your client and test.

Common pitfalls

  • Tool schemas that are too loose (the model misuses them).
  • No read-only mode for destructive actions.
  • Skipping auth on HTTP transport.

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Frequently asked questions

What language should I build an MCP server in? ↓
Python and TypeScript both have first-class SDKs. Pick whichever your team maintains; the protocol is the same.

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